Department of Radiology;
Severance Hospital;
Severance Pediatric Liver Disease Research Group;
Research Institute of Radiological Science;
Yonsei University College of Medicine;
Department of Surgery;
Severance Hospital;
Severance Pediatric Liver Disease Research Group;
Yonsei University College of Medicine;
Division of Gastroenterology;
Hepatology and Nutrition;
Department of Pediatrics;
Severance Children's Hospital;
Severance Pediatric Liver Disease Research Group;
Yonsei University College of Medicine;
Biliary; atresia; Magnetic; resonance; elastography; Kasai; operation; Splenic; stiffness; Portal; hypertension;